<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    /* 内部样式表(unternal) */
  /*选择器*/
  /* 两个div都可以找到 */

  /*div {
    color:red;
    font-size:30px;
    background-color: orange;
  }*/
  /* 找到class-one的元素 */
  .div-one {
    color:red;
    font-size:30px;
    background-color: orange;
  }
  </style>
</head>
<body>
  
<div class="div-one">我是div元素</div>
<div>我也是div元素</div>
<p>我是段落</p>
<h1>我是标题</h1>

</body>
</html>